Figure 3: Total phase diagram with all four layers.
From: Multiple tipping points and optimal repairing in interacting networks

Solid lines represent the borders of region 11 (green), 22 (blue), 12 (orange) and 21 (purple). Dashed lines represent cross-sections where we calculate the activity profile, shown in Fig. 4. It is noteworthy that there is a small central ‘window’ where all four states are possible.